feat: add metrics api endpoint

[alko89]

Added api endpoint for metrics. Started working on adding UI support for completed/failed graph, but I suck at React so it might take a while 😅

Updates #618

[felixmosh]

Hi @alko89 thank you for this PR, it definitely something that I would like to add to Bull-Board.
Since this data is "on demand" it should not be presented all the time in front of the user, therefore, I think that it can be inside the queue actions drop down, which will open a modal with the graphs, WDYT?

[alko89]

@felixmosh personally I would love to have metrics visible as soon as I click on a desired queue - 99% of what I use the dashboard for is to check job statuses and metrics. Maybe add it as the first tab in queue page if they are available, else hide the tab?

I'm also fine with other options that you find more appropriate :)

[dj-fiorex]

Hi guys, what's missing to make this happen? Can I help in any way? this function is useful

[alko89]

Think the API part is done. But I haven't got the time to work on the FE part yet unfortunately.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[nocodehummel]

2Cs, when adding Metrics as additional Tab it would be good to reduce the spaces for Tabs. On my screen the tabs-menu requires often horizontal scrolling while other content is visible.

[kyleolsondesign]

Any chance we could ship the API endpoint and work on the FE as a separate branch?